cygwin_set_impersonation_token

extern "C" void
cygwin_set_impersonation_token(

token);

const HANDLE token;

Use this function to enable the token given as parameter as
impersonation token for the next call to setuid or
seteuid. Use
cygwin_set_impersonation_token together with
cygwin_logon_user to impersonate users using
password authentication.